# Bayes' post vs AHA ACLS

The clearest difference is rating: AHA ACLS at 4.9 against Bayes' post's 3.7. AHA ACLS also leads on update cadence (every 2 months vs every 23 months) and ratings volume (277 vs 3). Bayes' post's advantage is in-app purchases (none vs 1) and review sentiment (50% vs 26%). On price, ads and device support there is nothing between them.

Both are free to download. AHA ACLS sells 1 in-app purchase, starting at $3.99 per year. Bayes' post asks for nothing beyond the download.

AHA ACLS holds the better App Store score, 4.9 against 3.7. That said, the two scores are not equally well evidenced: AHA ACLS has 277 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 50% of Bayes' post's written reviews are positive against 26% of AHA ACLS's, so the app with the better star average is not the one people write more warmly about.

Bayes' post ships an update every 23 months, AHA ACLS every 2 months. The most recent releases landed on October 23, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Bayes' post | AHA ACLS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/bayes-post-test-probability-calculator/id371920137/reviews) | **[4.9 (277 ratings)](https://appshunter.io/ios/app/aha-acls/id1506944443/reviews)** |
| Number of ratings | 3 | **277** |
| Positive reviews | **50.0% of reviews** | 26.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 2 months** |
| Monetization | **Free** | Subscription |
| Best chart rank | — | **#47** |
| Size | 20 MB | 48 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Keiji Matsui](https://appshunter.io/developer/365287272) | [Massachusetts General Hospital](https://appshunter.io/developer/376928206) |

## What reviewers say

### Bayes' post

[App page](https://appshunter.io/ios/app/bayes-post-test-probability-calculator/id371920137)

This medical app calculates the probability of a disease after a diagnostic test. It uses pre-test probability, test sensitivity, and specificity to determine post-test probabilities for both positive and negative results.

**Highlights:** Calculate post-test probability, Input pre-test probability, Use test sensitivity, Use test specificity, Analyze positive results, Analyze negative results

**Features:** macOS Compatibility

**In-app purchases:** none


### AHA ACLS

[App page](https://appshunter.io/ios/app/aha-acls/id1506944443)

**Currently charting:** #47 Top Grossing · Medical (US App Store)

This app provides clinicians with a digital tool to assist in running cardiac arrest codes and delivering advanced cardiac life support (ACLS) at the bedside. It features the latest AHA recommendations and includes intuitive access to algorithms, drug dosing, and timers for efficient patient care.

**Highlights:** 4 ACLS algorithms (cardiac arrest, tachycardia, bradycardia, post-arrest), Latest 2025 AHA ACLS content, Drug therapy and dosing, Easy-to-read timers, CPR and epinephrine logging, Rapid transition to post-arrest care

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ACLS Pro | $3.99 | per year |

**What reviewers like**

- ✅ Accurate, up-to-date AHA ACLS algorithms
- ⏱️ Built-in timers and counters for code management
- 👍 User-friendly, intuitive interface
- 🏥 Trusted by Harvard/MGH and American Heart Association
- 📋 Helpful for documentation and PCR completion

**What reviewers complain about**

- 💰 Subscription paywall on previously free app
- 🚨 Dangerous surprise paywall during active codes
- ⚠️ No warning before transition to paid model
- 🔐 Requires payment even for basic ACLS information
- 😤 Perceived greed from wealthy organizations (MGH/AHA)

**Reported bugs**

- App fails to load information despite subscription payment
- Users locked out of app mid-code
- Unexpected app crashes during critical moments

**Requested features**

- Multiple log storage with dates
- More detailed code logging with event documentation (IO access, medications, rhythms)
- End code button and pause compressions feature
- Real-time log tracking for back-charting
- LVAD algorithm inclusion


## Frequently asked questions

### Is Bayes' post free?

Bayes' post is free to download, with no in-app purchases.

### Is AHA ACLS free?

AHA ACLS is free to download, with in-app purchases available.

### Which has better reviews, Bayes' post or AHA ACLS?

AHA ACLS is rated higher. Bayes' post averages 3.7 out of 5 from 3 ratings, while AHA ACLS averages 4.9 from 277 ratings.

### Do Bayes' post or AHA ACLS have ads?

Neither Bayes' post nor AHA ACLS shows ads.

### Which is updated more often, Bayes' post or AHA ACLS?

Bayes' post ships an update every 23 months, and AHA ACLS every 2 months. Most recently, Bayes' post was updated on October 23, 2026 and AHA ACLS on October 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*